malacostraca

Malacostraca

Mal`a*cos"tra*ca\, n. pl. [NL., from Gr. ? soft + ? shell of a testacean.] (Zo["o]l.) A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
malacostraca

noun
largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies 
WordNet® 3.0, © 2006 by Princeton University.
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